USS Eastport was a steamer captured by the Union Navy during the American Civil War.

Eastport, a partially completed ironclad, was captured from the Confederates on 7 February 1862 at Cerro Gordo, Tennessee, by the Union gunboats Conestoga, Tyler and Lexington, commanded by Captain Seth Ledyard Phelps.

Converted at Cairo, Illinois, into an ironclad ram for use by the Union Army, she sailed from that port late in August under the command of Captain Phelps for duty in the Mississippi River between Island No.

She was back at Cairo, Illinois, for repairs when, on 1 October 1862, Eastport and the other vessels of the Western Flotilla were turned over to the Navy and joined the Mississippi Squadron.

She passed through the obstructions below Fort De Russy, in whose capture she joined, then continued up the Red River above Grand Ecore until 5 April, when she rounded to and stood down again.